I am looking a sub to add to my system My great room is 24 X 12 X 8 and opens up into the dining room. My front speakers consist of v4 Studio 40s and a CC590 with Atoms in the rear. The system is used for 60/40 HT/music. Which sub would be a better match? I can get a new DSP 3200 for a decent price or find a used Seismic 12. Another option I have a Ultracube 12. Any input would be appreciated.